Put it this way… The Orange Box is the most elaborate selection of new age FPS products that we’ll see for a long time to come, will house playability that will out last current releases and future ones a like. It will probably be the most quintessential FPS release since CS:S… BF2… etc.
For anyone buying inside the UK, I pre-ordered from Virgin Megastore (see this link). At 23 GBPounds it was the best deal I’ve come across. Oh, it includes free delivery too – just no confirmation available as per when that delivery is, though my past experience with VM is good.
Inside the US $49.99 seems to be the standard low price, though you can find quite a few companies who want you to pay nearly $60 or more so watch out. Amazon have it on pre-order at $44.99 (for PC, $54.99 for XBox360) and it looks like free-shipping, therefore being my choice if I was state-side.